Greenstar Gas Combi Boiler Models

Gas combi (combination) boilers are the most popular heating and hot water solution in the UK. Over 15 million have been fitted across the country and they are the preferred choice for most householders and installers.

All Worcester Greenstar combis are designed and manufactured to provide high levels of performance and operating efficiency. This is achieved through unique features like the ‘keep hot’ facility which ensures hot water is almost instantly available. The boilers also incorporate an ‘Eco’ mode button which can be used to override the ‘keep hot’ facility. This has the advantage of using less gas, as energy is only consumed when hot water is required.

Worcester Greenstar CDi Classic series

The Worcester Greenstar CDi Classic boiler is the top of the range combi boiler offering the highest levels of hot water comfort.

This boiler has set the benchmark within the industry for efficiency and reliability and is suitable for homes with one or two bathrooms.

Key benefits of the Worcester Greenstar CDi Classic boiler:

  • Highest hot water flow rate of the Greenstar combi wall mounted range
  • Simple boiler control knobs with clear temperature display
  • Low energy pump reduces electrical usage
  • Frost protection is included, reducing frost risk if installed in a garage or a loft
  • Larger two bathroom properties can be supplied by higher output options
  • Wide choice of controls enables greater comfort and economy
  • Instantaneous hot water, always available
  • Inbuilt keyless filling link making it easy to refill your system
  • Large Condensesure style siphon built into the boiler – effectively eliminates frost risk

Fitted from £2268 Inc. VAT

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Greenstar 29CDi Classic Greenstar 34CDi Classic Greenstar 38CDi Classic Greenstar 42CDi Classic

ErP Efficiency Rating – Water Heating
A A A A

ErP Efficiency Rating – Space Heating
A A A A

ErP Data Sheet


ErP Data Sheet


ErP Data Sheet


ErP Data Sheet


ErP Data Sheet

LPG model available
Yes Yes Yes Yes

Wave Compatible
Yes Yes Yes Yes

Solar Compatible
No No No No

Control Options
Yes Yes Yes Yes

Central heating output (kW)
29 34 38 42

Dimensions (mm) height x width x depth
760 x 440 x 360 760 x 440 x 360 760 x 440 x 360 760 x 440 x 360

Hot water flow rate 35°c ∆T (litres per minute)
12.3l/min 14.3l/min 16.4l/min 17.2l/min

Hot water flow rate 40°c ∆T (litres per minute)
11l/min 12l/min 14l/min 15l/min

Worcester Greenstar CDi Compact series

The Worcester Greenstar CDi Compact combi boiler is suitable for small, medium and large-sized properties with one or two bathrooms.

This boiler is designed to fit within a standard kitchen cupboard. Despite its compact size, the high outputs make it suitable for homes with more than one bathroom.

Key benefits of the Worcester Greenstar CDi Compact boiler:

  • Fits in a standard kitchen cupboard
  • User-friendly displays for ease of use
  • Hot water can be adjusted to fine tune your comfort
  • Simple boiler control knobs with clear temperature display
  • Frost protection is included, reducing frost risk if installed in a garage or a loft
  • Wide choice of controls enables greater comfort and economy
  • Low energy pump reduces electrical usage
  • Instantaneous hot water, always available
  • Achieves an A+ ErP package efficiency rating for heating when installed with a Wave smart internet connected control

Fitted from £2160 Inc. VAT

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Greenstar 28CDi Compact Greenstar 32CDi Compact Greenstar 36CDi Compact

ErP Efficiency Rating – Water Heating
A A A

ErP Efficiency Rating – Space Heating
A A A

ErP Data Sheet


ErP Data Sheet


ErP Data Sheet


ErP Data Sheet

LPG model available
Yes Yes Yes

Wave Compatible
Yes Yes Yes

Solar Compatible
Yes Yes Yes

Control Options
Yes Yes Yes

Central heating output (kW)
28 32 36

Dimensions (mm) height x width x depth
690 x 390 x 280 690 x 390 x 280 690 x 390 x 280

Hot water flow rate 35°c ∆T (litres per minute)
11.4l/min 13.1l/min 14.7l/min

Hot water flow rate 40°c ∆T (litres per minute)
10l/min 11.5l/min 12.9l/min

Worcester Greenstar Si Compact series

The Worcester Greenstar Si Compact combi boiler is suitable for small to medium sized homes with one bathroom.

This boiler is designed to fit within a standard kitchen cupboard and has an easy to use control that allows you to fine tune your comfort.

Key benefits of the Worcester Greenstar Si Compact boiler:

  • Fits in a standard kitchen cupboard
  • User-friendly displays for ease of use
  • Hot water can be adjusted to fine tune your comfort
  • Wide choice of controls enables greater comfort and economy
  • Frost protection is included, reducing frost risk if installed in a garage or a loft
  • Simple boiler control knobs with clear temperature display
  • Low energy pump reduces electrical usage
  • Instantaneous hot water, always available
  • Achieves an A+ ErP package efficiency rating for heating when installed with a Wave smart internet connected control

Fitted from £2040 Inc. VAT

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Greenstar 25Si Compact Greenstar 30Si Compact

ErP Efficiency Rating – Water Heating
A A

ErP Efficiency Rating – Space Heating
A A

ErP Data Sheet


ErP Data Sheet


ErP Data Sheet

LPG model available
Yes Yes

Wave Compatible
Yes Yes

Solar Compatible
No No

Control Options
Yes Yes

Central heating output (kW)
25 30

Dimensions (mm) height x width x depth
690 x 390 x 280 690 x 390 x 280

Hot water flow rate 35°c ∆T (litres per minute)
10.2l/min 12.3l/min

Hot water flow rate 40°c ∆T (litres per minute)
8.9l/min 10.7l/min

Worcester Greenstar i series

The Worcester Greenstar i combi boiler is ectremely popular and perfect for small to medium sized homes with one bathroom.

New to 2015, and replacing a well-established award-winning boiler that has been installed in over 1 million homes across the UK, the latest model now has a user friendly control that allows you to adjust your heating and hot water to meet your exact requirements.

Key benefits of the Worcester Greenstar i boiler:

  • Simple boiler controls with clear information display
  • Zero risk of condensate pipe freezing in severe weather
  • Wide choice of controls enables greater comfort and economy
  • Low energy pump reduces electrical usage
  • Instantaneous hot water, always available
  • Achieves an A+ ErP package efficiency rating for heating when installed with a Wave smart internet connected control

Fitted from £1928 Inc. VAT

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Greenstar 25i Greenstar 30i

ErP Efficiency Rating – Water Heating
A A

ErP Efficiency Rating – Space Heating
A A

ErP Data Sheet


ErP Data Sheet


ErP Data Sheet

LPG model available
Yes Yes

Wave Compatible
Yes Yes

Solar Compatible
No No

Control Options
Yes Yes

Central heating output (kW)
25 30

Dimensions (mm) height x width x depth
710 x 400 x 330 710 x 400 x 330

Hot water flow rate 35°c ∆T (litres per minute)
10.2l/min 12.3l/min

Hot water flow rate 40°c ∆T (litres per minute)
9l/min 10.8l/min

Worcester Greenstar Highflow CDi series

The Worcester Greenstar CDi Highflow is a well-established floor standing combi boiler that is renowned for industry-leading hot water flow rates.

Perfect for larger homes with two bathrooms.

Key benefits of the Worcester Greenstar Highflow CDi boiler:

  • Fits underneath a standard kitchen worktop
  • Larger two bathroom homes can be supplied by higher output options
  • Wide choice of controls enables greater comfort economy
  • Frost protection is included, reducing frost risk if installed in a garage or a cellar
  • Simple boiler control knobs with temperature display
  • Instantaneous hot water, always available

Fitted from £3600 Inc. VAT

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Greenstar Highflow 440CDi Greenstar Highflow 550CDi

ErP Efficiency Rating – Water Heating
A A

ErP Efficiency Rating – Space Heating
A A

ErP Data Sheet


ErP Data Sheet


ErP Data Sheet

LPG model available
Yes Yes

Wave Compatible
Yes Yes

Solar Compatible
No No

Control Options
Yes Yes

Central heating output (kW)
29 30

Dimensions (mm) height x width x depth
850 x 600 x 600 850 x 600 x 600

Hot water flow rate 35°c ∆T (litres per minute)
20 @ 35°c ∆T 25 @ 35°c ∆T

New Boiler Special Offer

For a limited time period, when you buy any new gas boiler, we’re offering your first year’s service worth £78 (inc. VAT) absolutely FREE.

Contact us today to get your quote and find out more.

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